The Australian state of Western Australia voted to secede from the federation, but efforts to implement the result proved to be unsuccessful.

Western Australia (WA) is the westernmost state of Australia. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to the south, the Northern Territory to the north-east, and South Australia to the south-east. Western Australia is Australia's largest state, with a land area of 2,527,013 square kilometres (975,685 sq mi), and is also the second-largest subdivision of any country on Earth.

The 1933 Western Australian secession referendum was held on 8 April 1933 on the question of whether the Australian state of Western Australia should leave the Australian federation. Nearly two-thirds of electors voted in favour of secession, but efforts to implement the result proved unsuccessful.